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dim
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2013-04-24T17:20:45.502476Z
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When rebooting (exiting) from the BTX loader, make sure to restore the
GDT from the correct segment, otherwise a triple fault would be caused.
In some virtual environments (VMware, VirtualBox, etc) this could lead
to a unhandled error or hang in the guest emulation software.

Thanks to avg and jhb for a few hints in the right direction.

Noticed by:	Jeremy Chadwick <jdc@koitsu.org> (and many others)
MFC after:	1 week

END